I have collected a large assortment of extra HDDs over the years. I don’t like throwing the things away because it seems like every time I trash a drive I end up needing it. I have some large drawers in my desk that I normally just toss the HDDs into and leave them until I need them.
Considering that HDDs are ESD sensitive devices that is far from the best way to store them. NewerTech has a new device for storing HDDs called the StoraDrive stackable anti-static cases for 3.5" HDDs. The cases come with two drawers that are anti-static and have a label on front for describing what is on the drive inside.
The cases are made from injection molded ABS plastic and have non-skid rubber feet to keep them in place. Each of the cases measures 6.9" x 4.6" x 1" and can hold any 3.5" HDD. A pair of the cases sells for $9.99.